Built in 1924, 898 Park Avenue is a sophisticated, white-glove boutique co-op with 10 units spread across 14 floors—each with private elevator entry. Located on the Upper East Side’s coveted Gold Coast at 79th Street, the building offers a full-time doorman, superintendent, elevator access, and laundry/storage in the basement. Originally developed by Henry Mandel as six duplexes and a grand ballroom, it converted to a co-op in 1953 with a total of 10 units. Mandel, known for projects like Pershing Square and London Terrace, worked with architects John Sloan and Albert Nast to create this finely crafted masonry building.